To solve the equation \(-\frac{1}{5}y + 3 = -7\) for \(y\), follow these steps:
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Subtract 3 from both sides of the equation:
\[ -\frac{1}{5}y + 3 - 3 = -7 - 3 \]
This simplifies to:
\[ -\frac{1}{5}y = -10 \]
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To isolate \(y\), multiply both sides by -5:
\[ y = -10 \times -5 \]
This simplifies to:
\[ y = 50 \]
So, the solution is:
\[ \boxed{50} \]